Real-time mobile carrier system for facility monitoring and control

ABSTRACT

Embodiments of a mobile carrier monitoring apparatus are disclosed. The apparatus includes one or more mobile carriers configured to receive items being manufactured in its interior and configured be moved by a transport system to multiple positions within a manufacturing facility. A mobile carrier control system is positioned in the interior or on the exterior of each mobile carrier, as are one or more sensors that are coupled to the mobile carrier control system. A communication system is positioned in the interior or on the exterior of each mobile carrier and communicatively coupled to the at least one sensor and to the mobile carrier control system, and an electrical power system positioned in the interior or on the exterior of each mobile carrier and coupled to deliver electrical power to the mobile carrier control system, to the one or more sensors, and to the communication system. Other embodiments are disclosed and claimed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation under 35 U.S.C. § 120 of U.S.application Ser. No. 15/496,461, filed 25 Apr. 2017 and still pending,which in turn claims priority under 35 U.S.C. § 119(e) to U.S.Provisional App. No. 62/329,810, filed 29 Apr. 2016. The entire contentof both priority applications is hereby incorporated by reference.

TECHNICAL FIELD

The disclosed embodiments relate generally to facility monitoring and inparticular, but not exclusively, to a real-time mobile carrier systemfor facility monitoring and control.

BACKGROUND

Business or factory internal monitoring systems are generally large andstationary machines and detection systems, which limits their detectionrange to the region immediately surrounding their location. Many ofthese detectors would be needed to adequately cover a large facility,but that would be expensive and would take up floor space that might beneeded by, or better used for, other equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

Non-limiting and non-exhaustive embodiments of are described below withreference to the following figures, wherein like reference numeralsrefer to like parts throughout the various views unless otherwisespecified.

FIGS. 1A-1B are drawings of an embodiment of mobile carrier system formonitoring a semiconductor fabrication facility.

FIG. 2 is a drawing of an embodiment of a monitoring system using mobilecarriers.

FIG. 3 is a three-dimensional diagram of an embodiment of a bare mobilecarrier without sensors or a collection system.

FIGS. 4A-4C are block diagrams of embodiments of a mobile carrierincluding one or more temperature monitoring sensors.

FIG. 5 is block diagram of an embodiment of a mobile carrier includingone or more airflow monitoring sensors.

FIG. 6 is block diagram of an embodiment of a mobile carrier includingone or more humidity, oxygen, water, and/or temperature monitoringsensors.

FIG. 7 is block diagram of an embodiment of a mobile carrier includingone or more vibration monitoring sensors.

FIG. 8 is block diagram of an embodiment of a mobile carrier includingone or more particle monitoring sensors.

FIG. 9 is block diagram of an embodiment of a mobile carrier includingone or more monitoring cameras.

FIG. 10 is block diagram of an embodiment of a mobile carrier includingone or more sensors for monitoring physical characteristics.

FIG. 11 is block diagram of an embodiment of a mobile carrier includingone or more location monitoring sensors.

FIGS. 12A-12B are block diagrams of an embodiment of a mobile carrierincluding one or more internal position monitoring sensors.

FIG. 13 is block diagram of an embodiment of a mobile carrier includinga sample collection system.

FIG. 14 is block diagram of another embodiment of a mobile carrierincluding a sample collection system.

FIG. 15 is a drawing of an embodiment of using multiple mobile carriersystems for monitoring.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

Embodiments are described of an apparatus, system, and method for areal-time facility monitoring and control using mobile carriers.Specific details are described to provide an understanding of theembodiments, but one skilled in the relevant art will recognize that theinvention can be practiced without one or more of the described detailsor with other methods, components, materials, etc. In some instances,well-known structures, materials, or operations are not shown ordescribed in detail but are nonetheless encompassed within the scope ofthe invention.

Reference throughout this specification to “one embodiment” or “anembodiment” means that a described feature, structure, or characteristiccan be included in at least one described embodiment. As a result,appearances of “in one embodiment” or “in an embodiment” do notnecessarily all refer to the same embodiment. Furthermore, theparticular features, structures, or characteristics may be combined inany suitable manner in one or more embodiments.

Disclosed below are embodiments of a mobile carrier system that can beused in a factory internal monitoring system with multiple detectionsystems. The disclosed embodiments extend the detection range andincrease automated applications. In addition, in some embodiments themobile carrier system can be used with a smart station; this smartstation provides central control, data transmission, power charging, andmodular replacement methods. It increases the mobile carrier system'susability and includes more detection items or detection systems.

Embodiments of a mobile carrier system can include a detection systemor/and a power system or/and a wireless or wired communicationtransmission system or/and a set of modular input and output connectionsystem. Embodiments of a smart station can include a set of modularinput and output connection system or/and a power supply system or/and awireless or wired communication transmission system or/and a stationoperating system or/and a set of detection systems.

Embodiments of the mobile carrier system can be used with multipledetection systems. In one embodiment, the mobile carrier system movesalong a transmission path or track to different locations to get thespecific measuring point data. It can also move to a specific locationand deliver the mobile carrier's detection system to the equipment, sothat the detection system performs the measurement for the equipment.Embodiments of the mobile carrier system can also move to a specificlocation, collect data, or material such as an analyte, from inside oroutside the carrier into the carrier system, and carry the analyte to aspecific analysis machine for measurement.

Embodiments of the mobile carrier system can operate with a self-built(i.e., on-board or self-contained) power system. When the self-builtpower system need to be charged, the carrier system can move to a smartbase station and the base station can provide power supply and charging.Embodiments of mobile carrier system detect and control by a wireless orwired communication transmission system that can transmit data orcontrol messages to a central control system for data analysis andprocessing. The output from the central control system can be providedto a system administrator or user, who can then use the integratedinformation to decide a corresponding method or strategy.

Embodiments of the mobile carrier system and smart station can beconnected by a modular input/output (I/O) coupling system. Every modularcoupling in the I/O coupling system provides the different I/O functionsuch as Ethernet, one or more tubes through which analyte or gas samplecan be transferred between the smart base station and the mobilecarrier, and so on. The modular I/O coupling system provides convenientreplacement, can reduce the design change time, and can also help usersdesign their own systems quickly. The smart base station can beintegrated with multiple detection systems (see below). The analytescarried from the mobile carrier system can be detected by the equipmentin the smart station.

FIGS. 1A-1B together illustrate an embodiment of a mobile carrier systemfor monitoring a manufacturing facility 100. Manufacturing line 100 canbe used in semiconductor fabrication, for instance, but in otherembodiments could be used for other purposes and with differentequipment than shown.

FIG. 1A illustrates a general layout of manufacturing line 100.Manufacturing line 100 is positioned in an enclosure 102, which can be abuilding, a room or bay within a building, or some other type ofenclosure. One or more process equipment modules 104 are positionedwithin enclosure 102. Each process equipment module 104 includes a loadport and can include one or more chambers, each of which performsdifferent functions related to the manufacturing steps carried out bythat particular process equipment module.

Manufacturing processes generally involve many steps, and each processequipment module performs only some of the steps in the overallmanufacturing process. As a result, the items being manufactured onmanufacturing line 100—semiconductor wafers with processors, memories,MEMS chips, optical chips, etc., in a semiconductor manufacturingfacility—must be moved from one process equipment module to anotheruntil all the steps in the process are performed. Track 110 windsthrough facility 102 to transport mobile carriers 106 (see FIG. 1B)—andhence items being manufactured, which are carried inside the mobilecarriers—to multiple process equipment modules; the illustratedembodiment has seven processing equipment modules 104 labeled P1-P7, butother embodiments can have a different number. After the items beingmanufactured move through all the process equipment modules 104 in aparticular enclosure 102, the transport system exits enclosure 102 withthe movable carrier.

FIG. 1B illustrates an embodiment of a mobile carrier system 150 formonitoring manufacturing line 100. Items being manufactured are movedaround the factory using mobile carriers 108 that carry the items beingmanufactured inside, often in a sealed micro environment. The mobilecarrier monitoring system uses the same mobile carriers 108 used totransport the items being manufactured to also transport sensors,analyzers, and sampling devices that can be used to monitor conditionsin the manufacturing facility. In different embodiments, mobile carriers108 can carry only sensors and/or sampling devices, or can carry bothitems being manufactured and sensors and/or sampling devices. In asemiconductor facility embodiment such as the one shown, mobile carriers108 are called Front-Opening Unified Pods (FOUPs), wafer containers, orsubstrate containers, because they are used to transport semiconductorwafers. But in other embodiments other types of movable carrier can beused.

A transport system carries each mobile carrier 108 around themanufacturing facility from the load port of one process equipmentmodule 104 to the load port of another, so that different manufacturingsteps can be performed on the items carried inside each movable carrier.In the illustrated embodiment, the transport system is an overheadtrack-and-hoist system. Wheeled and motorized carriages 112 run along atrack 110. A hoist 114 is mounted to each wheeled carriage 112 to liftmobile carriers 108 in the z direction and also potentially move them inthe y direction (i.e., into and out of the page) so that mobile carriers108 can be placed on load ports that can accommodate multiple carriers.Other embodiments of the mobile carrier system can get their mobilityfrom other systems such as automatic transport systems, automatic guidedvehicles (AGVs), overhead hoist transfer and Front Opening Unified Pod(OHT & FOUP), unmanned flying vehicles (UFV), and other mobility systemsused in the semiconductor industry, panel industry, logistics and so on.

In monitoring system 150, one or more mobile carriers 108 can each beconfigured to have one or more sensors, a sampling system, or both asampling system and sensors, positioned in their interior or on theirexterior. The sensors and sampling systems can be used to detect,measure, or otherwise characterize, quantitatively or qualitatively,conditions inside or outside the mobile carriers as they are movedaround facility 102 by the transport system.

Each mobile carrier 108 can be mated with a smart station 106 (see FIG.2) or with the load ports of process equipment modules 104 in thefacility. Each mobile carrier 108 can communicate, by wire orwirelessly, with a central data/control center 116 that monitors theoverall conditions in facility 102 as it receives data from the one ormore mobile carriers. Smart station 106 and process equipment module 104can also communicate, wirelessly or by wire, with data/control center116, so that when a mobile carrier is mated to smart station 106 or toprocess equipment module 104, the data from sensors or samplers inmobile carriers 108 can be transmitted to the data/control center by thesmart station or the process equipment module instead of directly by themobile carrier itself. Data/control center 116 can communicate, alsowirelessly or by wire, with a warning system or emergency response team118 so that they can be sent into the factory to follow up if abnormalconditions are detected. Data/control center 116 can also communicate,also wirelessly or by wire, with process equipment modules to sendcontrol signals that can adjust the processes in response to themonitoring measurements.

FIG. 2 illustrates embodiments of a monitoring system 200 that includesa smart station 202 and a mobile carrier 204. In one embodiment smartstation 202 can be stationary, but in other embodiments it can be mademobile, for instance by housing it in a cabinet with wheels.

Smart station 202 includes a housing 203 within which are located adetection and/or sampling system 206, a power supply system 208, astation operation system 210, and a wired or wireless communicationsystem 212. Detection and/or sampling system 206, power supply system208, station operation system 210, and wired or wireless communicationsystem 212 are all coupled to a modular coupling system 214 designed tobe compatible with a modular coupling system 224 on mobile carrier 204.The illustrated embodiment has a bus-type coupling between thecomponents and modular coupling system 214, but in other embodimentsthese couplings can be done differently and need not be a bus.

Detection and/or sampling system 206 is positioned within smart station202 and is coupled to at least one individual coupler of modularcoupling system 214. The detection and/or sampling system 206 can be adetection system, a sampling system, or both a detection system and asampling system. For detection, system 206 can include detectors oranalyzers to detect, measure, or otherwise characterize, quantitativelyor qualitatively, conditions inside or outside the smart station orconditions at locations were mobile carrier 204 has sampled itsenvironment as it moved around facility 102. Any of the detectorsdiscussed below for use in embodiments of mobile carrier 204 can also beused in embodiments of smart station 202. When detection and/or samplingsystem 206 operates as a sampling system, it can sample the environmentaround smart station 202 and can then analyze the sample using adetector or analyzer within the smart station itself, or it can transferthe collected sample, via modular coupling system 214, to a mobilecarrier 204, which can then use its detection system for analysis. Inone embodiment, sampling system 206 can be similar to the samplingsystem described below for FIGS. 13-14.

Power supply system 208 is positioned within smart station 202 and iscoupled to at least one individual coupler within modular couplingsystem 214. The power supply system can provide electrical power toother components within smart station 202 and can also be used to eitherdirectly power components within mobile carrier 204 when the mobilecarrier is docked on the smart station, or to charge the mobilecarrier's own power system, in this case power system 218. In anembodiment, power supply system 208 can also be coupled to an externalpower supply (not shown), for instance the electrical power supply ofthe facility in which the smart station is located.

Station operating system 210 is positioned within smart station 202 andis coupled to the other components within smart station 202—detectionand/or sampling system 206, power supply system 208, and wired orwireless communication system 212 in this embodiment—as well as beingcoupled to at least one individual coupler in modular coupling system214. In one embodiment, the hardware of station operating system 210 canbe a general-purpose computer including a processor, memory, storage,and so on, together with software having instructions that allow it toexchange data with, and control the functions of, the other componentswithin the smart station, as well as communicate with a mobile carrierwhen it is docked on the smart station. Station operating system 210 canalso be used to receive, process, and/or interpret data received fromother components within smart station 202 or from components withinmobile carrier 204. In other embodiments, station operating system 210can be a special-purpose computer such as an application specificintegrated circuit (ASIC), also with software having instructions thatcause it to perform the required functions.

Wired/wireless communication system 212 is positioned within smartstation 202 and is coupled to the other components within smart station202—detection and/or sampling system 206, power supply system 208, andstation operating system 210 in this embodiment—as well as being coupledto at least one individual coupler in modular coupling system 214.Wired/wireless communication system 212 can communicate with othercomponents within smart station 202 to exchange data with othercomponents, and can also communicate with communication system 220 whenmobile carrier 204 is docked on smart station 202, to exchange data withthe mobile carrier. Communication system 212 can also be communicativelycoupled, by wire or wirelessly, to exchange data with other externalcomponents, such as a data/control system 116 (see FIG. 1B).

Modular coupling system 214 is used to couple components within smartstation 202 to components within mobile carrier 204 when a mobilecarrier is docked on the smart station. As such, modular coupling system224 of the mobile carrier will be substantially compatible with modularcoupling system 214, with each individual coupler of modular couplingsystem 214 having a counterpart individual coupler for the same functionwithin modular coupling system 224. In the illustrated embodiment,coupling system 214 includes three couplings 214 a-214 c, but in otherembodiments can include a different number of couplings. The individualcouplers in coupling system 214 can include electrical couplings, fluidcouplings, communication couplings, or mechanical couplings. Forinstance, in one embodiment one individual coupler 214, and hence acorresponding coupler 224, can be for communication while anotherindividual coupler can be a fluid coupling that allows transfer of afluid sample from sampling system 216 to detection system 206. Inanother embodiment, one individual coupler 214, and hence acorresponding coupler 224, can be mechanical couplers that keep mobilecarrier 204 firmly in place when docked on smart station 202. In stillother embodiment, individual couplers can have multiple functions; forinstance, a pair of individual couplers could function as both a fluidcoupling and a mechanical coupling. Modular coupling systems 214 and 224allow quick connection and disconnection compared to a traditionalconnection interface.

Mobile carrier 204 has a set of components similar to smart station 202.The components are positioned within a housing 205, which is essentiallya mobile carrier used in the manufacturing process (see FIG. 3). In theillustrated embodiment, each component in smart station 202 has acorresponding component in mobile carrier 204: the components in mobilecarrier 204 include a detection and/or sampling system 216, a powersupply system 218, a control system 220, and a wired or wirelesscommunication system 220. But other embodiments of mobile carrier 204need not have a set of components corresponding to the components insmart station 202. In some embodiments mobile carrier 204 can be adedicated monitoring system—that is, it can carry only the componentsthat make up the monitoring system but no items being manufactured. Butin other embodiments it can carry both a monitoring system and itemsbeing manufactured.

In mobile carrier 204, detection and/or sampling system 216 has the samefunctions, and can include similar components to detection/samplingsystem 206; control system 222 has the same functions, and can includesimilar components, as station operating system 210; and wired orwireless communication system 220 has the same functions, and caninclude similar components as wireless communication system 212. In oneembodiment, the primary difference is in power system 218. Becausemobile carrier 204 is mobile, in one embodiment power system 218 is aself-contained power system, such as a rechargeable or replaceablebattery, rather than a power system that derives its power from anexternal source such as the facility's electrical power source. And inembodiments where power system 218 is self-contained, it would bedesirable to choose the other components in mobile carrier 204 to havelower power consumption that their analogous counterparts in smartstation 202.

As in smart station 202, the components of mobile carrier 204 arecoupled to a modular coupling system 224 designed to be compatible witha modular coupling system 214 on smart station 202. In the illustratedembodiment, coupling system 224 includes three couplings 224 a-224 c,but in other embodiments can include a different number of couplings.The individual couplers in coupling system 224 can also includeelectrical couplings, fluid couplings, communication couplings, ormechanical couplings. In the illustrated embodiment, the number ofindividual couplers 224 matches the number of individual couplers 214,but in other embodiments the numbers of couplers need not match exactly,so long as any individual coupler that does not find a correspondingcoupler in the other is not needed.

FIG. 3 illustrates an embodiment of a bare mobile carrier 300—that is, amobile carrier without any of the components shown in FIG. 2. In effect,then, bare mobile carrier 300 is housing 205 within which the componentsof the monitoring system are put (see FIG. 2). Mobile carrier 300 is ahexahedron, a cube in this case, but in other embodiments it can have adifferent shape such as cylindrical, triangular, etc. Mobile carrier 300has an exterior including top and bottom exterior surfaces 316 and sidesurfaces 314. A single interior chamber 304 can be used to house itemsbeing manufactured and the monitoring system components shown in FIG. 2,as described below, but other embodiments of mobile carrier can includemultiple interior chambers. Interior chamber 304 is bounded by floor306, walls 308, back wall 310, and ceiling 312. Sidewalls 318 occupy thespace between exterior surfaces and interior walls of mobile carrier300; the sidewalls can be solid, hollow, insulated, or used to housecomponents or connections between components. Mobile carrier 300 canalso include a door (not shown) that attaches to the front using hingesmounted on one of sidewalls 318 to close off interior chamber 304. Thedoor can seal the interior chamber 304, hermetically or nothermetically, from the outside environment.

FIGS. 4A-14 describe embodiments of mobile carriers with different typesof detection systems, sampling systems, or detection systems andsampling systems. In these figures, only the detection/sampling systemis shown to avoid cluttering the drawing, but of course other componentsof a mobile carrier, as shown in FIG. 2 and discussed above, as well asany needed interconnections between components, will be present eventhough not shown. And, although they are described individually, thedescribed sensors need not be used in isolation, but can be used in anycombination. For instance, a mobile carrier could pair one or more ofthe sensors in FIGS. 4A-12B together with a sampling system as shown inFIGS. 13-14. Finally, the mobile carriers illustrated in these figuresare shown and described in the context of a mobile carrier used forsemiconductor manufacturing, such as a FOUP, but in other embodiments adifferent type of carrier can be used.

FIGS. 4A-4B illustrate an embodiment of a mobile carrier 400 includingone or more temperature monitoring sensors. In mobile carrier 400, oneor more semiconductor wafers 404 are stacked in the interior of mobilecarrier 300 for transport between process equipment modules. Temperaturesensors 406 are positioned in the interior of the mobile carrier tomeasure the temperature of the wafers. In the illustrated embodiment, atemperature sensor is positioned on floor 306 to measure the temperatureof the bottom-most wafer, and thereafter one or more temperature sensors406 can be positioned between wafers to measure the temperature of thewafer above. In some embodiments only the temperature of a single wafer404, or a number of wafers smaller than the capacity of the carrier, canbe measured, but in other embodiments the temperature of every wafer canbe measured.

FIG. 4B illustrates an embodiment of a mechanism by which temperaturesensors 406 can measure the temperature of a wafer. A temperature probe408 is positioned inside a slider 410 and in thermal contact with athermally conductive pad 412. Slider 410 is held within sleeve 414 andcan move up and down relative to the sleeve. A low-force spring 416 isalso held within sleeve 414 and is used to push slider 410 toward wafer404 so that pad 412 is in contact with the wafer. Temperature probe 408then measures the temperature of wafer 404 through thermally conductivepad 412 and transmits its readings to processing circuitry via a wireconnection between probe 408 and the circuitry.

FIG. 4C illustrates an embodiment of a mobile carrier 450 including atemperature monitoring sensor. Mobile carrier 450 is in many respectssimilar to mobile carrier 400. In mobile carrier 450, one or moresemiconductor wafers 404 are stacked in the interior of mobile carrier300 for transport between process equipment modules. The primarydifference between mobile carriers 450 and 400 is that mobile carrier450 includes a single temperature sensing module positioned 406 in themobile carrier near floor 306. Temperature sensing module 406 is coupledby wires 454 to multiple temperature sensing probes 452 located atmultiple wafers 404. In the illustrated embodiment wires 454 are routedthrough the sidewalls 318 of mobile carrier 300, but other arrangementscould route the wires differently than shown, for instance along theexterior of the carrier. In the illustrated embodiment, temperaturesensing probes 452 can be the same probe described in FIG. 4B, but canbe a different kind of probe in other embodiments. With thisarrangement, temperature sensing module 406 can detect the temperatureof multiple wafers in the carrier, up to and including every wafer inthe carrier.

FIG. 5 illustrates an embodiment of a mobile carrier 500 including oneor more airflow monitoring sensors. In mobile carrier 500, one or moresemiconductor wafers 404 are stacked in the interior of mobile carrier300 for transport between process equipment modules. Airflow sensors 502are positioned in the interior of the carrier to measure airflowquantities, such as direction and speed, within the interior. In theillustrated embodiment, airflow sensors 502 are positioned on the floor,ceiling, walls, and back wall, but other embodiments need not positionairflow sensors on every interior wall and other embodiments can usemore or less airflow sensors than shown. Airflow sensors 504 can also bepositioned on the exterior bottom, top, and side surfaces of the carrierto measure airflow quantities, such as direction and speed, outsidemobile carrier 400 or in or near process equipment with which mobilecarrier 400 has been mated. Other embodiments need not position airflowsensors on every exterior surface, and other embodiments can use more orless airflow sensors than shown. In one embodiment, air flow sensors canmonitor the air flow in the carrier when it is docked on the load portof a process equipment module during a carrier air purge/clean process.The flow information can be used to adjust the purge air flow pressureor total volume to achieve an optimum mobile carrier cleaning process.

FIG. 6 illustrates an embodiment of a mobile carrier 600 including ahumidity, oxygen, water and/or temperature monitoring sensors. In mobilecarrier 600, one or more semiconductor wafers 404 are stacked in theinterior of mobile carrier 300 for transport between process equipmentmodules. An H₂O (water), oxygen, temperature, or humidity sensor 602 ispositioned in the interior of the carrier, on or near the floor of thecarrier.

Sensor 602 includes sampling tubes 604 fluidly coupled to the sensor andto the interior of the carrier to draw in air from the interior of thecarrier for measurement. Sensor 602 also includes sampling tubes 606that extend through the bottom sidewall to fluidly couple the sensor andto the exterior of the mobile carrier so that it can draw in air fromthe exterior of the carrier for measurement—for instance ambient airfrom the facility or air from a process equipment module to which thecarrier 600 was coupled. The sensor can thus detect theH₂O/oxygen/temperature and humidity conditions inside the carrier or ina machine or in the environment outside the carrier. In otherembodiments the routing of the internal and external sampling tubes canbe different than shown—sampling tubes 604 or 606 could be routedthrough the sidewalls 318 of carrier 300, for instance, and otherembodiments need not sample both internal and external air.

FIG. 7 illustrates an embodiment of a mobile carrier 700 including oneor more vibration monitoring sensors. In mobile carrier 700, one or moresemiconductor wafers 404 are stacked in the interior of mobile carrier300 for transport between process equipment modules. A three-axisvibration sensor 702 is positioned in the interior chamber of thecarrier, on or near the carrier floor, to detect vibration of the mobilecarrier, vibration of the parts (e.g., wafers) inside, vibration ofprocess equipment modules to which the mobile carrier 700 is mated, andvibration in the environment. For instance, vibration sensor 702 can beused to detect 3-axis vibration and check motion stability when carrier700 moves along the track 110 (see FIG. 1B). Other embodiments ofcarrier 700 can have more vibration sensors than shown, can havedifferent vibration sensors than shown, and can position themdifferently than shown.

FIG. 8 illustrates an embodiment of a mobile carrier 800 including oneor more particle monitoring sensors. In mobile carrier 800, one or moresemiconductor wafers 404 are stacked in the interior of mobile carrier300 for transport between process equipment modules. A particle sensor802 is positioned in the interior chamber of the carrier, on or near thefloor. Sensor 802 includes sampling tubes 804 fluidly coupled to thesensor and to the interior of the carrier to draw in air from theinterior of the carrier for measurement. Sensor 802 also includessampling tubes 806 that extend through the bottom sidewall 318 tofluidly couple the sensor to the exterior of the carrier so that it candraw in air from the exterior for measurement—for instance ambient airfrom the facility or air from a process equipment module to which thecarrier was coupled. The sensor can thus detect particle contaminationinside the carrier or particle contamination outside the carrier in amachine or in the environment. In other embodiments, the routing ofinternal and external sampling tubes can be different thanshown—sampling tubes 804 and 806 could be routed through sidewalls 318of carrier 300, for instance—and other embodiments need not sample bothinternal and external air.

FIG. 9 illustrates an embodiment of a mobile carrier 900 including oneor more cameras. In mobile carrier 900, one or more semiconductor wafers404 are stacked in the interior of mobile carrier 300 for transportbetween process equipment modules. Cameras can be positioned at variouspositions in the interior chamber of the carrier: cameras 904 can bepositioned on one or more sidewalls, a camera 906 can be positioned in acorner of the interior chamber, or cameras can be positioned on thefloor or ceiling. Cameras 902 can also be positioned on the exteriorsurfaces of the carrier. Cameras 902, 904, and 906 can be used, forexample, for visual detection of conditions inside the carrier, visualdetection of the carrier's path, or visual detection of the condition ofprocess equipment modules to which the carrier has been mated.

FIG. 10 is block diagram of an embodiment of a mobile carrier 1000including one or more sensors for monitoring physical characteristics orchemical characteristics such as product film thickness. In mobilecarrier 1000, one or more semiconductor wafers 404 are stacked in theinterior of mobile carrier 300 for transport between process equipmentmodules. In the illustrated embodiment, a physical/chemical propertymeasurement module or sensor 1002 is positioned in the interior chamberof mobile carrier 300 to monitor physical properties (e.g., filmthickness, topography, reflective index) or chemical properties(composition, impurity) of material that is deposited on one or more ofthe wafers 404. But in another embodiment, the measurement module 1002can be positioned in a smart station 1004 configured to receive a waferfor measurement, so that one or more of the wafers can be carried backto the smart station and transferred to the smart station formeasurement instead of being measured inside the mobile carrier.

FIG. 11 illustrates an embodiment of a mobile carrier 1100 including oneor more location monitoring sensors that can be used to determine and/orrecord the position of mobile carrier 1100 within a manufacturingfacility. The location monitoring sensors can also determine and/orrecord the positions of process equipment modules, machine parts, thepositions where detection or sampling of the internal or externalenvironment takes place in the facility. Although not illustrated in thefigure, one or more semiconductor wafers can be stacked in the interiorof mobile carrier 1100 for transport between process equipment modules.

In one embodiment, a Global Positioning System (GPS) unit 1102 thatdetermines its own location, and hence the location of mobile carrier1100, is positioned on the floor in the interior of the carrier,although in other embodiments GPS unit 1102 could be positioned on theoutside of the unit or elsewhere in the inside, so long as it canreceive a signal from satellites 1104 to determine its position.

In another embodiment, a Radio Frequency Identification (RFID) readercan be positioned on the top surface of the carrier, for instance on theroof, where it can determine the position of carrier 1100 by reading oneor more RFID tags 1106 positioned in the facility. In the illustratedembodiment, RFID tag 1106 is positioned at a known location on track 110of the transport system used to move the carrier (see FIG. 1B), so thatwhen RFID reader 1104 detects RFID tag 1106 it knows that its positionalong the track is substantially the same as the position of the RFIDtag. In other embodiments, RFID tag 1106 could be positioned at adifferent location in the facility.

In still another embodiment, a bar code reader 1108 can be positioned onthe exterior of the carrier, for instance on the top surface, where itcan determine the position of carrier 1100 by reading one or more barcodes 1110 positioned in the facility. In the illustrated embodiment,bar code 1110 is positioned at a known location on track 110 of thetransport system, so that when bar code reader 1108 detects bar code1110 it knows that its position along the track is substantially thesame as the position of the bar code. In other embodiments, bar code1110 could be positioned at a different location in the facility. Otherdetection methods, such as machine vision, can also be used to determinethe location of mobile carrier 1100.

FIGS. 12A-12B together illustrate an embodiment of a mobile carrier 1200including one or more internal position monitoring sensors; FIG. 12A isa top view, FIG. 12B a side view. In mobile carrier 1200, one or moresemiconductor wafers 404 are stacked in the interior of mobile carrier300 for transport between process equipment modules. But in some cases,it is possible for wafers 404 to become misaligned inside the carrier,for instance as shown by the wafer 404 with the dashed outline, which istoo close to the rear wall of the carrier and could become damaged as aresult.

To prevent wafer damage, an internal monitoring system can be put in theinterior of the carrier to detect the position of the wafers inside. Inthe illustrated embodiment, a light source 1202 can be positioned on thefloor of the carrier along the back wall so that it directs light at adetector 1204 positioned on the ceiling of the carrier along the backwall. With this arrangement, if there is no interruption of the beamemitted by light source 1202 then the wafers 404 are correctlypositioned, but if there is a partial or total interruption of the beam,then one of the wafers is out of position. The illustrated embodimentshows only one detector, but in other embodiments multiple detectors, aswell as other types of detectors, can be used in additional positionswithin the interior chamber of the mobile carrier.

FIG. 13 illustrates an embodiment of a mobile carrier 1300 including asample collection system. In mobile carrier 1300, one or moresemiconductor wafers 404 are stacked in the interior of the mobilecarrier for transport between process equipment modules.

A sampling bottle or canister 1302 is positioned in the interior of thecarrier, on or near the floor of the carrier. Sampling bottle 1302includes sampling tubes 1304 fluidly coupled to the interior of thesampling canister and to the interior of the carrier to draw in air fromthe interior of the carrier for collection. Sampling bottle 1302 alsoincludes sampling tubes 1306 that extend through the floor of thecarrier to fluidly couple the interior of the sampling bottle to theexterior of the carrier so that it can collect air from the exterior ofthe mobile carrier—for instance ambient air from the facility or airfrom a process equipment module to which the carrier was coupled. In anembodiment without sampling tubes 1306, a sample from the exterior canbe collected simply by opening the door of the mobile carrier. In otherembodiments, the routing of internal and external sampling tubes can bedifferent than shown—sampling tubes could be routed through thesidewalls of container 1300, for instance—and other embodiments need notsample both internal and external air.

In one embodiment sampling bottle 1302 can be pre-vacuumed so that itcan draw in samples, but in another embodiment a pump 1308 can befluidly coupled to the interior of the sampling canister to draw airinto the bottle. The samples collected in sampling canister 1302 can besaved for later analysis by an analyzer or sensor within carrier 1300 orby an analyzer or sensor separate from carrier 1300, for instance ananalyzer or sensor in a smart station with which mobile carrier 1300will later dock. Still other embodiments of mobile carrier 1300 caninclude sensors in addition to the sample collection system. Theillustrated embodiment includes airflow sensors 1310 positioned in theinterior of the mobile carrier and airflow sensors 1312 positioned onthe exterior of the mobile carrier, but any other type of sensors couldalso be used together with the sample collection system.

FIG. 14 illustrates another embodiment of a mobile carrier 1400including a sample collection system. In mobile carrier 1400, one ormore semiconductor wafers 404 are stacked in the interior of the mobilecarrier for transport between process equipment modules.

A trap sampler 1402 having a sorbent 1403 inside is positioned in theinterior chamber of the carrier, on or near the floor. In variousembodiments, sorbent 1403 can include combinations of granular, wallcoatings, or continuous filling sorbents. Each sorbent can have achemical affinity for one or more particular chemicals, meaning that theexact sorbents used will depend on the number and nature of chemicals tobe absorbed and concentrated. Examples of sorbents that can be usedinclude cabopack B, cabopack X, etc.

Trap sampler 1402 includes sampling tubes 1404 that fluidly couple theinterior of the trap sampler to the interior of the mobile carrier sothat the trap sampler can collect air from the interior of the mobilecarrier, and also includes sampling tubes 1406 that extend through thefloor of the mobile carrier to fluidly couple the interior of the trapsampler to the exterior of the mobile carrier so that the trap samplercan collect samples from the exterior of the mobile carrier, forinstance ambient air from the facility or air from a process equipmentmodule to which the carrier was coupled. In other embodiments, therouting of internal and external sampling tubes can be different thanshown—sampling tubes 1304 or 1306 could be routed through the sidewallsof container 1400, for instance—and other embodiments need not sampleboth internal and external air.

In one embodiment trap sampler 1402 can be pre-vacuumed so that it candraw in samples, but in another embodiment a pump 1408 can be fluidlycoupled to the interior of the trap sampler to draw air into the trapsampler. A heater 1410 can also be thermally coupled to the trampsampler to heat the sorbent inside to help release the compoundscaptured by the sorbent. The samples collected in trap sampler 1402 canbe saved for later analysis by an analyzer or sensor within carrier 1400or by an analyzer or sensor separate from carrier 1400, for instance ananalyzer or sensor in a smart station with which the mobile carrier willlater dock. Still other embodiments of mobile carrier 1400 can includesensors in addition to the sample collection system. The illustratedembodiment includes airflow sensors 1410 positioned in the interior ofthe mobile carrier and airflow sensors 1412 positioned on the exteriorof the mobile carrier, but any other type of sensors could also be usedtogether with the sample collection system.

FIG. 15 illustrates an embodiment of the use of multiple mobile carriersfor monitoring. In the illustrated example, mobile carrier 1502 caninclude an airborne molecular contamination (AMC) detector together witha location sensor. If mobile carrier 1502 detects AMC or abnormal levelsof AMC as it passes over process equipment module 104, it can transmitits position and the detected AMC levels to data/control center 116.Data/control center 116, knowing the location of mobile carrier 1502,can then direct another nearby mobile carrier 1504 with a samplingsystem (see, e.g., FIGS. 13-14) to dock on the load port of processequipment module 104 and sample the air in that module to see if it isthe source of the AMC detected by mobile carrier 1502. In anotherembodiment, mobile carrier 1504 need not actually dock with processequipment module 104, but can actually just sample the air near module104.

The above description of embodiments, including what is described in theabstract, is not intended to be exhaustive or to limit the invention tothe described forms. Specific embodiments of, and examples for, theinvention are described herein for illustrative purposes, but variousequivalent modifications are possible within the scope of the inventionin light of the above detailed description, as those skilled in therelevant art will recognize.

The terms used in the following claims should not be interpreted tolimit the invention to the specific embodiments disclosed in thespecification and the claims. Rather, the scope of the invention is tobe determined entirely by the following claims, which are to beinterpreted using established claim interpretation doctrines.

What is claimed is:
 1. A mobile carrier monitoring apparatus comprising:one or more mobile carriers configured to receive items beingmanufactured in its interior and configured be moved by a transportsystem to multiple positions within a manufacturing facility; a mobilecarrier control system positioned in the interior or on the exterior ofeach mobile carrier; one or more sensors positioned in the interior oron the exterior of each mobile carrier, the one or more sensors beingcoupled to the mobile carrier control system; a communication systempositioned in the interior or on the exterior of each mobile carrier andcommunicatively coupled to the at least one sensor and to the mobilecarrier control system, wherein the communication system can transmitdata from the one or more sensors to a location separate from the mobilecarrier; and an electrical power system positioned in the interior or onthe exterior of each mobile carrier and coupled to deliver electricalpower to the mobile carrier control system, to the one or more sensors,and to the communication system.
 2. The apparatus of claim 1, furthercomprising a modular coupling system positioned in or on each mobilecarrier, the modular coupling system being coupled to the electricalpower system, the communication system, and the mobile carrier controlsystem.
 3. The apparatus of claim 2 wherein the modular coupling systemcan include electrical couplings, fluid couplings, communicationcouplings, or mechanical couplings.
 4. The apparatus of claim 1 whereinthe one or more sensors can include: an airborne molecular contaminationanalyzer; a temperature sensor including one or more temperature probes;an airflow sensor; a sensor that measures one or more of water (H₂O),oxygen, temperature, and humidity; a vibration sensor; a particlesensor; a camera; a sensor for measuring physical or chemicalcharacteristics; a location sensor; or an internal position sensor. 5.The apparatus of claim 1 wherein the communication system cancommunicate wirelessly or by wire with the location separate from themobile carrier.
 6. The apparatus of claim 1, further comprising asampling system positioned in the interior or on the exterior of eachmobile carrier.
 7. The apparatus of claim 6 wherein the sampling systemcomprises: a canister; one of more sampling tubes fluidly coupled to theinterior of the canister and also fluidly coupled to at least one of theinterior of the mobile carrier and the exterior of the mobile carrier.8. The apparatus of claim 7 wherein the sampling system furthercomprises a pump fluidly coupled to the interior of the canister.
 9. Theapparatus of claim 6 wherein the sampling system comprises: a trapsampler including a sorbent therein; one of more sampling tubes fluidlycoupled to the interior of the canister and also fluidly coupled to atleast one of the interior of the mobile carrier and the exterior of themobile carrier.
 10. The apparatus of claim 9 wherein the sampling systemfurther comprises at least one of: a pump fluidly coupled to theinterior of the trap sampler; and a heater thermally coupled to the trapsampler to heat the sorbent inside the trap sampler.